EP1451659B1 - Control member with tensed cables - Google Patents

Control member with tensed cables Download PDF

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Publication number
EP1451659B1
EP1451659B1 EP02799093A EP02799093A EP1451659B1 EP 1451659 B1 EP1451659 B1 EP 1451659B1 EP 02799093 A EP02799093 A EP 02799093A EP 02799093 A EP02799093 A EP 02799093A EP 1451659 B1 EP1451659 B1 EP 1451659B1
Authority
EP
European Patent Office
Prior art keywords
sheath
cables
arm
base
control unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02799093A
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German (de)
French (fr)
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EP1451659A1 (en
Inventor
Florian Gosselin
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Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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Commissariat a lEnergie Atomique CEA
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Publication of EP1451659A1 publication Critical patent/EP1451659A1/en
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Publication of EP1451659B1 publication Critical patent/EP1451659B1/en
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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/016—Input arrangements with force or tactile feedback as computer generated output to the user
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G9/00—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously
    • G05G9/02—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only
    • G05G9/04—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously
    • G05G9/047—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously the controlling member being movable by hand about orthogonal axes, e.g. joysticks
    • G05G9/04785—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously the controlling member being movable by hand about orthogonal axes, e.g. joysticks the controlling member being the operating part of a switch arrangement
    • G05G9/04788—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously the controlling member being movable by hand about orthogonal axes, e.g. joysticks the controlling member being the operating part of a switch arrangement comprising additional control elements
    • G05G9/04796—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously the controlling member being movable by hand about orthogonal axes, e.g. joysticks the controlling member being the operating part of a switch arrangement comprising additional control elements for rectilinear control along the axis of the controlling member
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G9/00—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously
    • G05G9/02—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only
    • G05G9/04—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously
    • G05G9/047—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously the controlling member being movable by hand about orthogonal axes, e.g. joysticks
    • G05G2009/04777—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously the controlling member being movable by hand about orthogonal axes, e.g. joysticks with additional push or pull action on the handle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20207—Multiple controlling elements for single controlled element
    • Y10T74/20305—Robotic arm
    • Y10T74/20329—Joint between elements
    • Y10T74/20335—Wrist
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20396—Hand operated
    • Y10T74/20402—Flexible transmitter [e.g., Bowden cable]
    • Y10T74/2042—Flexible transmitter [e.g., Bowden cable] and hand operator

Definitions

  • the subject of this invention is a control member whose essential element is a group of tensioned cables.
  • a known control member comprises an operating element, in the form of a thimble and in which the user introduces a phalangette, and which is suspended from four tensioned cables which are, in the embodiment proposed by the authors, unwound from vertices of a regular tetrahedron, or on four of the vertices of a cube, always diametrically opposed on facets of the cube.
  • the force return motors which ensure the tensioning of the cables, are arranged at these peaks.
  • the tensioned cable type control member disposed between a generally fixed base and a movable wrist comprises: a sheath joined to the base by a double joint; three cables for actuating between the sheath and the base and connecting to the base in as many connection points surrounding the sheath; an arm carrying the wrist, sliding in the sheath; and at least one actuating means between the arm and the sheath, the cables and the actuating means ensuring the control of movements of the organ.
  • the cables and actuating means ensure the active control of movements of the organ, that is to say that their free length, or more generally their state, is variable, but that they maintain the member at a fixed position at rest and oppose a certain resistance to the movements of the body imposed by the user, to provide the body stiffness that allows a more pleasant and more precise control.
  • the usual means in this technique consists of a so-called force feedback motor, most often provided with an encoder which measures its movements and transmits them to the machine controlled by the member, to then also contribute to the control.
  • Figure 1 thus shows four cables 1 to 4 similar and taking place from respective motors 5 to 8 placed at the corners of a regular tetrahedron and all placed on a fixed base not shown.
  • the cables 1 to 4 converge to a die 9 in which an operator engages the finger and moves to the desired position by changing the unwound lengths of the cables 1 to 4.
  • a 3D Spacial Interface Device Using Tensed Strings "by Ishii and Sato published in the journal” Presence "(volume 3, number 1, winter 1994, pages 81-86).
  • the motor 6 (only represented completely) comprises an output shaft 10 which rotates a pulley 11 in which the cable 3 is wound; the cable 3 passes through a die 12 (at the top of the tetrahedron) which gives it a fixed point, and an angle encoder 13 is connected to the output shaft 10 to follow his movements and communicate them to the machine controlled by the organ.
  • the base of the control member bears the reference 15; it is flat and carries three actuating motors 16, 17 and 18 similar to the motors already encountered, and a double joint 19 connected to a sheath 20.
  • An arm 21 slides in the sheath 20 and leaves through an open end 22 of the latter, which is opposed to the double joint 19.
  • the free end of the arm 20 carries a wrist 23, that is to say a double or triple joint that allows to tilt a member 24 held by the operator, such as a pen, in all directions and possibly rotate it.
  • Motors 16, 17 and 18 are associated with cables 25, 26 and 27 which are stretched from a point of connection to the base 15, which can be formed by a known die, such as 12, to the open end 22 of the sheath 20, where they are hooked therein forming a pyramid edge network.
  • the system consisting of the cables of the sheath 20 and the arm 21 is a control member with three degrees of freedom, that is to say it allows to place the wrist 23 at any point of a volume working.
  • the motors 16 to 18 and 29 and the cables 25 to 28 make it possible to maintain the control member at the position it has reached while at the same time providing the operator with a stiffness during the movements.
  • the first three cables 25, 26, and 27 hold the sheath 20 and the arm 21 at the inclination which has been given to them on the base 15 according to the first two degrees of freedom of the member, and the fourth cable 28 maintains the degree of depression given to the arm 21 in the sheath 20 according to the third degree of freedom of the organ.
  • the wrist 23 may also be provided with force return motors which make it possible to control additional degrees of freedom related to the inclination of the pen 24. It may also become useful to authorize pivoting. of the arm 21.
  • the sheath 20 could then pivot with the arm 21 by replacing the double joint 19 cardan joint which only allows to adjust the inclination of the sheath 20 on the base 15 by a triple ball joint .
  • FIG. 2A represents an embodiment variant where the sheath 20 and an arm 21 have round and concentric sections to allow the arm to pivot; if a force return is desired according to this pivoting, the fourth cable 28 can be wound at one end at least around the arm 21, in front of the pads 31. It comprises at least one turn 28 'at this location. A degree of freedom has been added. Translation and rotation force return movements can also be obtained simultaneously with the use of an additional motor.
  • the space for the user is well cleared since all the cables extend below it; but the stiffness of control remains a little weak, which justifies the development a little different from Figure 3.
  • the double joint 19 or the ball joint
  • the points of attachment of the first three cables 25, 26 and 27 to the sheath 20 have been interchanged, i.e. the double joint 19 is now near the open end 22 of the sheath 20, hooked to a support 32 in the form of a stem of the base 15, and that the lower end 33 of the sheath 20 carries a point of attachment 34 cables 25, 26 and 27, which are now substantially coplanar.
  • the fourth motor 29 is no longer located on the sheath 20 but on the support 32, and only one end of the fourth cable 28 runs on his arm 21 and hangs on him; the complement 28 "of the cable 28 extends on the support 32 to the motor 29 from which it is unwound.
  • one of the first three cables, for example 27, extends beyond the device hooking 33 and penetrates into the sheath 20, and its end is hooked to the arm 21.
  • the stiffness at the extension of the arm 21 is produced by the motor 18 of the cable 27 and the driving stiffness of the arm 21 is produced by the motor 29 of the fourth cable 28.
  • the motor 18 also serves, as previously, to react to the inclination movements of the sheath 20, as the motors 16 and 17.
  • FIG. 4 Another embodiment not shown uses a cable attached at both ends to the arm 24, as in FIGS. 2 and 3, with a motor remote on the support 32 as in FIG. 4.
  • FIG. 5 illustrates a composite member composed of a pair of control members of the invention (for example of FIG. 4), the two arms 21 being substantially parallel and their wrists 23 being joined by a connecting rod 34 carrying The control member thus formed has five degrees of freedom without having to use a wrist complicated structure, as for previous achievements. It should be noted that the two elementary organs can be fairly close to one another without producing any risk of significant singularity.
  • control member proposed here thus offers a particularly simple structure. It can be applied to the main areas of control by a master arm, traditional or developing, such as telemanipulation, telesurgery, games, computer-aided design, etc.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Automation & Control Theory (AREA)
  • Manipulator (AREA)
  • Mechanical Control Devices (AREA)

Description

Le sujet de cette invention est un organe de commande dont un élément essentiel est un groupe de câbles tendus.The subject of this invention is a control member whose essential element is a group of tensioned cables.

Les organes de commande ou bras maîtres connus, utilisés dans divers domaines, reposent sur des mécanismes différents (voir par exemple US-A-4 820 162). On a ainsi proposé des bras composés de tronçons articulés successifs, qui présentent cependant une certaine complexité, une inertie notable, et des singularités cinématiques qui limitent les mouvements qu'on peut leur infliger. C'est pourquoi des organes d'autres genres ont encore été proposés.Known control members or arms, used in various fields, rely on different mechanisms (see for example US-A-4,820,162). We have thus proposed arms composed of successive articulated sections, which however have a certain complexity, a notable inertia, and cinematic singularities which limit the movements that can be inflicted on them. This is why organs of other genres have been proposed.

Ainsi, un organe de commande connu comprend un élément de manoeuvre, en forme de dé à coudre et dans lequel l'utilisateur introduit une phalangette, et qui est suspendu à quatre câbles tendus qui sont, dans la réalisation proposée par les auteurs, déroulés des sommets d'un tétraèdre régulier, ou encore sur quatre des sommets d'un cube, toujours diamétralement opposés sur des facettes du cube. Les moteurs de retour d'efforts, qui assurent la mise en tension des câbles, sont disposés à ces sommets. En déplaçant le dé, l'utilisateur modifie les longueurs déroulées des câbles, et les mesures correspondantes permettent d'accomplir la commande souhaitée. Ce mécanisme est simple et commode mais présente l'inconvénient d'être encombrant, les câbles s'étendant de tous côtés du dé.Thus, a known control member comprises an operating element, in the form of a thimble and in which the user introduces a phalangette, and which is suspended from four tensioned cables which are, in the embodiment proposed by the authors, unwound from vertices of a regular tetrahedron, or on four of the vertices of a cube, always diametrically opposed on facets of the cube. The force return motors, which ensure the tensioning of the cables, are arranged at these peaks. By moving the die, the user modifies the uncoiled lengths of the cables, and the corresponding measurements make it possible to accomplish the desired command. This mechanism is simple and convenient but has the disadvantage of being bulky, the cables extending on all sides of the die.

L'invention propose un nouvel agencement d'organe de commande dont la structure est simple et peu coûteuse et qu'on puisse facilement doter d'une raideur satisfaisante. Sous sa forme plus générale, l'organe de commande du type à câbles tendus, disposé entre une embase généralement fixe et un poignet mobile comprend : une gaine jointe à l'embase par une articulation double ; trois câbles d'actionnement entre la gaine et l'embase et se raccordant à l'embase en autant de points de raccordement entourant la gaine ; un bras porteur du poignet, coulissant dans la gaine ; et au moins un moyen de d'actionnement entre le bras et la gaine , les câbles et le moyen d'actionnement assurant le contrôle de mouvements de l'organe. Au sens de l'invention les câbles et moyens d'actionnement assurent le contrôle actif de mouvements de l'organe, c'est-à-dire que leur longueur libre, ou plus généralement leur état, est variable, mais qu'ils maintiennent l'organe à une position fixe au repos et opposent une certaine résistance aux mouvements de l'organe imposés par l'utilisateur, afin d'apporter à l'organe une raideur qui permet une commande plus agréable et plus précise. Le moyen usuel dans cette technique consiste en un moteur dit à retour d'effort, le plus souvent muni d'un codeur qui mesuré ses mouvements et les transmet à l'engin commandé par l'organe, pour alors contribuer aussi à la commande.The invention proposes a new arrangement of control member whose structure is simple and inexpensive and that it can easily provide a satisfactory stiffness. In its more general form, the tensioned cable type control member disposed between a generally fixed base and a movable wrist comprises: a sheath joined to the base by a double joint; three cables for actuating between the sheath and the base and connecting to the base in as many connection points surrounding the sheath; an arm carrying the wrist, sliding in the sheath; and at least one actuating means between the arm and the sheath, the cables and the actuating means ensuring the control of movements of the organ. Within the meaning of the invention, the cables and actuating means ensure the active control of movements of the organ, that is to say that their free length, or more generally their state, is variable, but that they maintain the member at a fixed position at rest and oppose a certain resistance to the movements of the body imposed by the user, to provide the body stiffness that allows a more pleasant and more precise control. The usual means in this technique consists of a so-called force feedback motor, most often provided with an encoder which measures its movements and transmits them to the machine controlled by the member, to then also contribute to the control.

L'invention sera maintenant décrite en détail au moyen des figures suivantes :

  • la figure 1 représente l'organe de commande à câble connu précédemment décrit,
  • les quatres figures 2, 3, 4, et 5 représentent autant de modes de réalisation de l'invention, et les figures 2A et 2B sont deux coupes à travers l'organe dans la réalisation de la figure 2, d'après deux variantes de réalisation.
The invention will now be described in detail by means of the following figures:
  • FIG. 1 represents the known cable control member previously described,
  • the four figures 2, 3, 4 and 5 represent as many embodiments of the invention, and FIGS. 2A and 2B are two sections through the member in the embodiment of FIG. 2, according to two variants of FIG. production.

La figure 1 représente donc quatre câbles 1 à 4 semblables et se déroulant de moteurs respectifs 5 à 8 placés aux coins d'un tétraèdre régulier et tous posés sur une embase fixe non représentée. Les câbles 1 à 4 convergent vers un dé 9 dans lequel un opérateur engage le doigt et qu'il déplace à la position voulue en modifiant les longueurs déroulées des câbles 1 à 4. Un tel système est décrit plus complètement dans l'article "A 3D Spacial Interface Device Using Tensed Strings" par Ishii et Sato paru dans la revue "Presence" (volume 3, numéro 1, hiver 1994, aux pages 81 à 86). Les auteurs mentionnent aussi qu'on peut perfectionner ce système en le dédoublant dans le même espace et en plaçant un autre dé dont les câbles seraient déroulés de moteurs placés aux quatre sommets inoccupés du cube et dans lequel l'opérateur introduirait un autre doigt de la main, notamment le pouce.Figure 1 thus shows four cables 1 to 4 similar and taking place from respective motors 5 to 8 placed at the corners of a regular tetrahedron and all placed on a fixed base not shown. The cables 1 to 4 converge to a die 9 in which an operator engages the finger and moves to the desired position by changing the unwound lengths of the cables 1 to 4. Such a system is described more fully in the article "A 3D Spacial Interface Device Using Tensed Strings "by Ishii and Sato published in the journal" Presence "(volume 3, number 1, winter 1994, pages 81-86). The authors also mention that this system can be perfected by splitting it in the same space and placing another die whose cables would be unrolled from the motors placed at the four unoccupied vertices of the cube and into which the operator would introduce another finger of the hand, including the thumb.

L'agencement des quatre moteurs est identique : c'est ainsi que le moteur 6 (seul représenté complètement) comprend un arbre de sortie 10 qui fait tourner une poulie 11 dans laquelle le câble 3 est enroulé ; le câble 3 passe par une filière 12 (au sommet du tétraèdre) qui lui donne un point fixe, et un codeur d'angle 13 est relié à l'arbre de sortie 10 pour suivre ses mouvements et les communiquer à l'engin commandé par l'organe.The arrangement of the four motors is identical: thus the motor 6 (only represented completely) comprises an output shaft 10 which rotates a pulley 11 in which the cable 3 is wound; the cable 3 passes through a die 12 (at the top of the tetrahedron) which gives it a fixed point, and an angle encoder 13 is connected to the output shaft 10 to follow his movements and communicate them to the machine controlled by the organ.

Dans la première réalisation de l'invention de la figure 2, l'embase de l'organe de commande porte la référence 15 ; elle est plane et porte trois moteurs d'actionnemnt 16, 17 et 18 analogues aux moteurs déjà rencontrés, ainsi qu'une articulation double 19 reliée à une gaine 20. Un bras 21 coulisse dans la gaine 20 et en sort par une extrémité ouverte 22 de celle-ci, qui est opposée à l'articulation double 19. L'extrémité libre du bras 20 porte un poignet 23, c'est-à-dire une articulation double ou triple qui permet d'incliner un élément 24 tenu par l'opérateur, tel qu'un stylo, dans toutes les directions et éventuellement de le faire pivoter. Aux moteurs 16, 17 et 18 sont associés des câbles 25, 26 et 27 qui sont tendus depuis un point de raccordement à l'embase 15, pouvant être formé par une filière connue, telle que 12, jusqu'à l'extrémité ouverte 22 de la gaine 20, où ils y sont accrochés en formant un réseau en arêtes de pyramide. Il existe un quatrième câble 28 logé dans la gaine 20 et courant le long du bras 21, où il est accroché par ses extrémités. Il forme cependant une boucle à un endroit où il est enroulé autour d'une poulie d'un quatrième moteur 29 fixé à la gaine 20, sur sa face extérieure; en traversant une fente 30 de la gaine 20 percée à cet endroit. On voit que le quatrième câble 28, tendu entre la gaine 20 et le bras 21, et son moteur 29 forment ensemble un moyen d'actionnement entre la gaine 20 et le bras 21. Des patins 31 de glissement ou tout autre moyen adéquat, visibles à la figure 2B, sont disposés entre la gaine 20 et le bras 21 pour permettre un mouvement coulissant guidé.In the first embodiment of the invention of Figure 2, the base of the control member bears the reference 15; it is flat and carries three actuating motors 16, 17 and 18 similar to the motors already encountered, and a double joint 19 connected to a sheath 20. An arm 21 slides in the sheath 20 and leaves through an open end 22 of the latter, which is opposed to the double joint 19. The free end of the arm 20 carries a wrist 23, that is to say a double or triple joint that allows to tilt a member 24 held by the operator, such as a pen, in all directions and possibly rotate it. Motors 16, 17 and 18 are associated with cables 25, 26 and 27 which are stretched from a point of connection to the base 15, which can be formed by a known die, such as 12, to the open end 22 of the sheath 20, where they are hooked therein forming a pyramid edge network. There is a fourth cable 28 housed in the sheath 20 and running along the arm 21, where it is hooked by its ends. However, it forms a loop where it is wrapped around a pulley of a fourth motor 29 fixed to the sheath 20 on its outer face; through a slot 30 of the sheath 20 pierced at this location. It can be seen that the fourth cable 28, stretched between the sheath 20 and the arm 21, and its motor 29 together form an actuating means between the sheath 20 and the arm 21. Glides 31 of sliding or any other adequate means, visible in Figure 2B, are arranged between the sheath 20 and the arm 21 to allow guided sliding movement.

Le système composé des câbles de la gaine 20 et du bras 21 est un organe de commande à trois degrés de liberté, c'est-à-dire qu'il permet de placer le poignet 23 à n'importe quel point d'un volume de travail. Les moteurs 16 à 18 et 29 et les câbles 25 à 28 permettent de maintenir l'organe de commande à la position qu'il a atteinte tout en instaurant une raideur agréable à l'opérateur pendant les déplacements. Les trois premiers câbles 25, 26, et 27 maintiennent la gaine 20 et le bras 21 à l'inclinaison qui leur a été donnée sur l'embase 15 selon les deux premiers degrés de liberté de l'organe, et le quatrième câble 28 maintient le degré d'enfoncement donné au bras 21 dans la gaine 20 selon le troisième degré de liberté de l'organe. Comme on l'a déjà mentionné, le poignet 23 peut être muni aussi de moteurs de retour d'effort qui permettent de commander des degrés de liberté supplémentaires liés à l'inclinaison du stylo 24. Il peut aussi devenir utile d'autoriser le pivotement du bras 21. La gaine 20 pourrait alors pivoter avec le bras 21 en remplaçant l'articulation double 19 en joint de cardan qui ne permet que d'ajuster l'inclinaison de la gaine 20 sur l'embase 15 par une articulation triple en rotule. Afin d'interdire des pivotements du bras 21 dans la gaine 20, et des dommages au câble 28, il est prévu de leur donner les sections polygonales illustrées à la figure 2B.The system consisting of the cables of the sheath 20 and the arm 21 is a control member with three degrees of freedom, that is to say it allows to place the wrist 23 at any point of a volume working. The motors 16 to 18 and 29 and the cables 25 to 28 make it possible to maintain the control member at the position it has reached while at the same time providing the operator with a stiffness during the movements. The first three cables 25, 26, and 27 hold the sheath 20 and the arm 21 at the inclination which has been given to them on the base 15 according to the first two degrees of freedom of the member, and the fourth cable 28 maintains the degree of depression given to the arm 21 in the sheath 20 according to the third degree of freedom of the organ. As already mentioned, the wrist 23 may also be provided with force return motors which make it possible to control additional degrees of freedom related to the inclination of the pen 24. It may also become useful to authorize pivoting. of the arm 21. The sheath 20 could then pivot with the arm 21 by replacing the double joint 19 cardan joint which only allows to adjust the inclination of the sheath 20 on the base 15 by a triple ball joint . In order to prevent pivoting of the arm 21 in the sheath 20, and damage to the cable 28, it is intended to give them the polygonal sections illustrated in Figure 2B.

Au contraire, la figure 2A représente une variante de réalisation où la gaine 20 et un bras 21 ont des sections rondes et concentriques pour permettre au bras de pivoter ; si un retour d'effort est souhaité selon ce pivotement, le quatrième câble 28 peut s'enrouler à une extrémité au moins autour du bras 21, en avant des patins 31. Il comporte au moins une spire 28' à cet endroit. Un degré de liberté a ainsi été ajouté. Des mouvements à retour d'effort de translation et de rotation peuvent aussi être obtenus simultanément moyennant l'utilisation d'un moteur supplémentaire.On the contrary, FIG. 2A represents an embodiment variant where the sheath 20 and an arm 21 have round and concentric sections to allow the arm to pivot; if a force return is desired according to this pivoting, the fourth cable 28 can be wound at one end at least around the arm 21, in front of the pads 31. It comprises at least one turn 28 'at this location. A degree of freedom has been added. Translation and rotation force return movements can also be obtained simultaneously with the use of an additional motor.

Dans ce mode de réalisation, l'espace pour l'utilisateur est bien dégagé puisque tous les câbles s'étendent au-dessous de lui ; mais la raideur de commande reste un peu faible, ce qui justifie l'aménagement un peu différent de la figure 3. Là, l'articulation double 19 (ou la rotule) et les points d'accrochage des trois premiers câbles 25, 26 et 27 à la gaine 20 ont été intervertis, c'est-à-dire que l'articulation double 19 se trouve désormais près de l'extrémité ouverte 22 de la gaine 20, accrochée à un support 32 en forme de potence de l'embase 15, et que l'extrémité inférieure 33 de la gaine 20 porte un point d'accrochage 34 des câbles 25, 26 et 27, qui sont désormais sensiblement coplanaires. Il apparaît immédiatement que les efforts exercés par l'utilisateur sur le poignet 23 produisent un moment plus faible puisque le bras de levier est réduit à la longueur libre du bras 21, et que la résistance des moteurs 16 à 18 est plus difficile à vaincre. De plus, l'angle de la gaine 20 et des câbles 25 à 27 est en général plus grand que dans le mode de réalisation précédent, de sorte que leur tension exerce un moment plus grand. Ces deux différences donnent une plus grande raideur à l'organe de commande. On notera aussi qu'il est possible que des mouvements angulaires de basculement plus importants soient communiqués au poignet 23, et que l'espace de travail est plus dégagé en raison de l'éloignement plus grand entre les trois premiers câbles 25 à 27 et le poignet 23. On peut aussi placer les moteurs 16 à 18 au-dessus de l'extrémité 33, ce qui permet de plus grands débattements en rotation au prix d'un encombrement plus important.In this embodiment, the space for the user is well cleared since all the cables extend below it; but the stiffness of control remains a little weak, which justifies the development a little different from Figure 3. There, the double joint 19 (or the ball joint) and the points of attachment of the first three cables 25, 26 and 27 to the sheath 20 have been interchanged, i.e. the double joint 19 is now near the open end 22 of the sheath 20, hooked to a support 32 in the form of a stem of the base 15, and that the lower end 33 of the sheath 20 carries a point of attachment 34 cables 25, 26 and 27, which are now substantially coplanar. It immediately appears that the forces exerted by the user on the wrist 23 produce a lower moment since the lever arm is reduced to the free length of the arm 21, and that the resistance of the motors 16 to 18 is more difficult to overcome. In addition, the angle of the sheath 20 and cables 25 to 27 is generally larger than in the previous embodiment, so that their tension exerts a greater moment. These two differences give greater stiffness to the control member. It will also be noted that it is possible for greater angular tilt movements to be communicated to the wrist 23, and that the working space is more unobstructed because of the greater distance between the first three cables 25 to 27 and the wrist 23. The motors 16 to 18 can also be placed above the end 33, which allows greater rotational movements at the cost of a larger footprint.

Dans le mode de réalisation de la figure 4, on a repris la conception d'ensemble de la figure 3, mais le quatrième moteur 29 n'est plus situé sur la gaine 20 mais sur le support 32, et seule une extrémité des quatrième câble 28 court sur le bras 21 et est accrochée à lui ; le complément 28" du câble 28 s'étend sur le support 32 jusqu'au moteur 29 d'où il se déroule. De plus, l'un des trois premiers câbles, par exemple 27, s'étend au-delà du dispositif d'accrochage 33 et pénètre dans la gaine 20, et son extrémité est accrochée au bras 21. Ainsi, la raideur à l'extension du bras 21 est produite par le moteur 18 de ce câble 27 et la raideur d'enfoncement du bras 21 est produite par le moteur 29 du quatrième câble 28. Le moteur 18 sert aussi, comme précédemment, à réagir aux mouvements d'inclinaison de la gaine 20, comme les moteurs 16 et 17.In the embodiment of Figure 4, we have taken over the overall design of Figure 3, but the fourth motor 29 is no longer located on the sheath 20 but on the support 32, and only one end of the fourth cable 28 runs on his arm 21 and hangs on him; the complement 28 "of the cable 28 extends on the support 32 to the motor 29 from which it is unwound.In addition, one of the first three cables, for example 27, extends beyond the device hooking 33 and penetrates into the sheath 20, and its end is hooked to the arm 21. Thus, the stiffness at the extension of the arm 21 is produced by the motor 18 of the cable 27 and the driving stiffness of the arm 21 is produced by the motor 29 of the fourth cable 28. The motor 18 also serves, as previously, to react to the inclination movements of the sheath 20, as the motors 16 and 17.

Un autre mode de réalisation non représenté utilise un câble attaché à ses deux extrémités au bras 24, comme sur les figures 2 et 3, avec un moteur déporté sur le support 32 comme sur la figure 4.Another embodiment not shown uses a cable attached at both ends to the arm 24, as in FIGS. 2 and 3, with a motor remote on the support 32 as in FIG. 4.

La figure 5 illustre un organe composite composé d'une paire d'organes de commande de l'invention (par exemple de la figure 4), les deux bras 21 étant sensiblement parallèles et leurs poignets 23 étant réunis par une tige de liaison 34 porteuse du stylo 24. L'organe de commande ainsi constitué présente cinq degrés de liberté sans qu'on ait à utiliser de poignet à structure compliquée, comme pour les réalisations précédentes. Il est à noter que les deux organes élémentaires peuvent être assez rapprochés l'un de l'autre sans produire de risque de singularité important.FIG. 5 illustrates a composite member composed of a pair of control members of the invention (for example of FIG. 4), the two arms 21 being substantially parallel and their wrists 23 being joined by a connecting rod 34 carrying The control member thus formed has five degrees of freedom without having to use a wrist complicated structure, as for previous achievements. It should be noted that the two elementary organs can be fairly close to one another without producing any risk of significant singularity.

L'organe de commande proposé ici offre donc une structure particulièrement simple. Il peut être appliqué aux principaux domaines de la commande par un bras maître, traditionnels ou en développement, comme la télémanipulation, la téléchirurgie, les jeux, la conception assistée par ordinateur, etc.The control member proposed here thus offers a particularly simple structure. It can be applied to the main areas of control by a master arm, traditional or developing, such as telemanipulation, telesurgery, games, computer-aided design, etc.

Claims (8)

  1. Control unit of the type with tensed cables arranged between a base (15) and a movable wrist (23), the unit comprising: a sheath (20) joined to the base by a double joint (19); three actuating cables (25, 26, 27) between the sheath and the base and connecting to the base at the same number of connecting points surrounding the sheath; an arm (21) supporting the wrist (23), sliding into the sheath; and at least one actuating means (28, 29) between the arm and the sheath, the cables and the actuating means ensuring the control of movements of the unit.
  2. Control unit as claimed in claim 1, characterized in that the actuating means includes a cable (28) stretched between the sheath (20) and the arm (21) and controlled by a motor (29), and in that the three cables stretched between the sheath (20) and the base (15) are controlled by respective motors (16, 17, 18).
  3. Control unit as claimed in claim 1, characterized in that the actuating means includes a cable (28) stretched between the arm (21) and the base (32) and controlled by a motor placed on the base, in that the three cables stretched between the sheath and the base are controlled by respective motors, and one of the three cables extends beyond the sheath to a fastening point on the arm.
  4. Control unit as claimed in any of claims 1 to 3, characterized in that the three cables (25, 26, 27) are arranged like the edges of a pyramid, and the double joint (19) is surrounded by the connecting points of the cables to the base.
  5. Control unit as claimed in any of claims 1 to 4, characterized in that the three cables are substantially coplanar and the double joint (19) is placed at a location of the sheath (20) from which the arm (21) exits.
  6. Control unit as claimed in any of claims 1 to 5, characterized in that the double joint is a ball joint.
  7. Control unit as claimed in any of claims 1 to 5, characterized in that the arm is capable of being rotated inside the sheath.
  8. Composite control unit, characterized in that it includes a pair of units according to any of the preceding claims, the base being common to the units, the arms being joined to a common wrist by ball joints.
EP02799093A 2001-12-10 2002-12-06 Control member with tensed cables Expired - Lifetime EP1451659B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0115913 2001-12-10
FR0115913A FR2833367B1 (en) 2001-12-10 2001-12-10 CONTROL DEVICE WITH TENSILE CABLES
PCT/FR2002/004208 WO2003050639A1 (en) 2001-12-10 2002-12-06 Control member with tensed cables

Publications (2)

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EP1451659A1 EP1451659A1 (en) 2004-09-01
EP1451659B1 true EP1451659B1 (en) 2006-08-16

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EP (1) EP1451659B1 (en)
JP (1) JP2005512223A (en)
AU (1) AU2002364319A1 (en)
DE (1) DE60214032T2 (en)
FR (1) FR2833367B1 (en)
WO (1) WO2003050639A1 (en)

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WO2003050639A1 (en) 2003-06-19
JP2005512223A (en) 2005-04-28
AU2002364319A1 (en) 2003-06-23
EP1451659A1 (en) 2004-09-01
US20050016316A1 (en) 2005-01-27
FR2833367B1 (en) 2004-01-30
FR2833367A1 (en) 2003-06-13
DE60214032D1 (en) 2006-09-28
US7698966B2 (en) 2010-04-20
DE60214032T2 (en) 2007-02-22

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